Curve fitting of mixed-mode isopachics
Curve fitting of mixed-mode isopachics
复制标题
混合模式等速曲线拟合
DOI：
10.1088/1742-6596/181/1/012062
复制
发表时间：
2009
期刊：
影响因子：
2.1
通讯作者：
P. Tatum
中科院分区：
文献类型：
--
作者：
R. I. Hebb;J. Dulieu‐Barton;K. Worden;P. Tatum
Recent work has focused on exploiting the observation that the stress-sum contours (isopachics), obtained from TSA, in the vicinity of the tip take the form of a simple curve – the cardioid. The analysis made use of the cardioid nature of the isopachics by deriving expressions for the SIFs in terms of the cardioid area and the positions of certain tangents to the curve. Both Genetic Algorithms (GAs) and Differential Evolution (DE) have also proved successful for parameter estimation, but some of the curve-fits indicated that the cardioid form was inappropriate for the base model, particularly for mixed-mode cracks. The effect of crack-tip interaction has been explored and shows this has a small effect on the cardioid form. New, higher resolution infra-red detectors have become available since the original data was collected, so the object of the current paper is to use new techniques to extract the cardioid form and use a GA to perform the curve fitting.
DOI：
10.1243/03093247jsa381
发表时间：
2008
期刊：
The Journal of Strain Analysis for Engineering Design
影响因子：
--
作者：
Fruehmann R
通讯作者：
Fruehmann R